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jsa -24, 1929. Mr. John N. Olin, Western 'Ca~rtride Compay, Eat Alton, Illinois. DearMr. Olin: I ws extemely interested in the c lippig about snails i pasits of birds acd &nalns and bae md e a note to lok u rofessor BJqaert when I reach M achustts. Rio f-r lin of asonlrn is the s as3 rently enoo~ntered in talktý to Dr. ULae al a italisTat tbe Unilverity of Vichi~an. Dr. La Rue is more secfic L that he snests t the breding rag of aterfowl m7 be determined b the distribrttion of certain parites of fish, snail and other aquatic life which harbor in these aim ae antexneiteate )ostv and w.,Ach are fatal to -aterfoil duringtejvnl t 7e has definitly provn this cndtt in to est in tho a&* of the Ie rri -kil V, ich for tVhu reaeen ca t reed on certain inland lakes tibt br# sco-fTally in the adant prts of L4ake Michigan where the fish, probably 7pserh, are n~t prasitizod. These lines of thoudht are extrem.ly' el-nfict -nd yaur @hlpi-,~n will help me to kecp track of them. Yours sincerely, A.Xlo iOPOLDo In G'ha-c* Garn Survey. P.8 O rao why I a anxious to start a fellowshp at Michigan is that D. Lana. would cooperate in thestu4. He is vGrY Ien about it.